Overview
The 24AA025UID-I/OT is a 2Kbit serial EEPROM memory device featuring a factory-programmed 64-bit unique identifier (UID). Manufactured in a compact surface-mount package, this IC provides reliable non-volatile data storage with 1 million erase/write cycle endurance. Its integrated UID supports IEEE® EUI-48™/EUI-64™ standards, enabling plug-and-play device identification for network-connected equipment. Designed for industrial temperature ranges (-40°C to +85°C), the device operates from 1.7V to 5.5V, making it suitable for battery-powered applications. The I2C interface supports clock frequencies up to 400kHz, offering flexible integration with microcontrollers and processors. These characteristics make the 24AA025UID-I/OT particularly valuable for IoT edge devices requiring both configuration storage and secure identification.
Structure and Working Principle
The device architecture consists of a 256×8-bit EEPROM array with page write capability (16-byte pages), address counter, and I2C-compatible serial interface circuitry. The UID is stored in a separate read-only memory area that's accessible at a predefined I2C address. Data transfer follows standard I2C protocol with device addressing, word addressing, and bidirectional data transmission. During write operations, an internal charge pump generates the required programming voltage. The memory array uses floating gate technology where charge trapping determines bit states. A built-in write-protect pin allows hardware protection of critical memory sections. The UID portion employs one-time programmable (OTP) technology to ensure permanent, tamper-proof identification.
Key Features
The 24AA025UID-I/OT distinguishes itself through several technical advantages. The pre-programmed 64-bit UID eliminates the need for manual device numbering while ensuring global uniqueness. With typical standby current below 1μA and active current under 3mA, the device excels in power-sensitive designs. The 2Kbit memory offers byte-wise and page-wise (16 bytes) write modes for flexible data management. Additional features include a noise-filtered SCL/SDA input for reliable communication in electrically noisy environments, and a built-in write cycle timer that automatically manages programming sequences. The device guarantees data retention for 200 years and supports partial page writes. These characteristics make it particularly suitable for industrial automation, medical devices, and consumer electronics where reliable identification and parameter storage are critical.
Application Areas
This EEPROM finds extensive use in IoT device manufacturing, where it serves dual purposes of storing firmware parameters and providing hardware-based identification. Network equipment manufacturers utilize the UID for MAC address assignment without database management. In industrial settings, the chip enables automatic equipment identification in PLC systems and robotic workcells. Consumer electronics applications include smart home devices, wearables, and gaming peripherals requiring unique hardware IDs. The medical device industry employs these chips for instrument tracking and calibration data storage. Automotive aftermarket applications include ECU modules and telematics devices where the UID supports secure component authentication.
Maintenance and Precautions
Proper handling ensures maximum reliability and lifespan. Although the device is ESD-protected (≥4000V), standard anti-static precautions should be observed during installation. Designers should implement I2C bus pull-up resistors (typically 4.7kΩ) for signal integrity. The WP (write protect) pin functionality should be utilized to prevent accidental modification of critical memory areas. In systems with unstable power supplies, ensure VCC remains within specifications during write operations to prevent data corruption. When soldering, follow JEDEC J-STD-020 guidelines for moisture sensitivity (MSL3). For firmware development, incorporate write-cycle counting to monitor memory wear and implement error checking for critical data storage applications.
B2B Procurement Guide
When sourcing 24AA025UID-I/OT chips, verify the manufacturer's certification to ensure authentic Microchip Technology products. Key specifications to confirm include the operating voltage range (1.7V-5.5V), temperature grade (industrial -40°C to +85°C), and package type (SOT-23-5 or similar). For large-volume purchases (10,000+ units), negotiate pricing based on annual commitment levels. Lead times typically range from 8-12 weeks for standard orders, so plan procurement accordingly. Consider ordering samples for qualification testing, paying attention to UID uniqueness verification. Reputable distributors provide batch traceability documentation, which is essential for medical and automotive applications. Evaluate alternative packaging options (tape & reel vs. tubes) based on your production line requirements.
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